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Blekko, the perky little search engine startup that lets you customize your search results, is taking the fight against web spam to a new level. It already allows searchers to mark results as spam and keeps a spam clock that counts how many spam pages are on the web (743 million and counting). Now it is about to block content farms like Demand Media’s eHow and Answerbag entirely. The top 20 sites its users have marked as a source of web spam will now be blocked (see full list below).

Concerns are rising that spam is increasingly taking over search results. So much so that Google recently vowed to become more vigilant and downgrade content farms specifically in search rankings.

Now Blekko is going to do one better and ban the worst offenders entirely. Here is the list of banned sites: